Hi Oscar,

I can feel your stress and fear through your post. Many Doctors have missed DX oral cancer more than once. I would get a referral to a ENT and demand a biospy of the lump. You have to be your own advocate as it is your life they are dealing with. For piece of mind I would demand a biospy. Better to error on the safe side than rely on his judgement.
I went to my primary care physican three times for a sore throat and the first two times she blew it off as nothing. I only wish I knew then what I know now. Anything that doesn't heal in two weeks has to be checked further.

A second opinion is warrented here!!!

Dan